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The response of lead-tungstate scintillators (PWO) to photons with energies in the range 13 MeVa64 MeV

The response of a matrix of 25 lead tungstate (PWO) scintillator detectors, operated at a25 [deg]C, to photons in the range 13 MeVa64 MeV has been measured at the tagged-photon facility at MAX-lab, Lund. The tapered PWO crystals, each with a length of 200 mm and a cross-section of 24.4A24.4 mm2 in t...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2012-07, Vol.679, p.36-43
Main Authors: Marcks von Wurtemberg, K, Geren, L, Lundberg, O, Tegner, P-E, Fransson, K, Grape, S, Johansson, T, Thome, E, Wolke, M, Brudvik, J, Fissum, K, Hansen, K, Isaksson, L, Lundin, M, Schroeder, B
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container_title Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
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creator Marcks von Wurtemberg, K
Geren, L
Lundberg, O
Tegner, P-E
Fransson, K
Grape, S
Johansson, T
Thome, E
Wolke, M
Brudvik, J
Fissum, K
Hansen, K
Isaksson, L
Lundin, M
Schroeder, B
description The response of a matrix of 25 lead tungstate (PWO) scintillator detectors, operated at a25 [deg]C, to photons in the range 13 MeVa64 MeV has been measured at the tagged-photon facility at MAX-lab, Lund. The tapered PWO crystals, each with a length of 200 mm and a cross-section of 24.4A24.4 mm2 in the front end, read out by 19 mm photomultiplier tubes, were arranged in a 5A5 matrix. The response was measured for photons directed towards the centre of the central crystal as well as for photons directed towards the corner of the central crystal, where four crystals meet. The obtained energy resolution surpasses what has been published so far and is close to the limit given by Poisson statistics and escaped energy. For photons directed towards the centre(corner) of the central crystal the relative energy resolution, defined as (FWHM/2.35) / E gamma , decreases from 7.3%(11.0%) at E gamma = 13 MeV to 3.3%(3.6%) at E gamma = 64 MeV . The reconstructed point of impact of a photon in this energy range is determined with an uncertainty (one standard deviation) of 7.3A-0.1 mm.
doi_str_mv 10.1016/j.nima.2012.03.030
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subjects Accelerators
Cross sections
Crystals
Detectors
Energy resolution
Photons
Standard deviation
Statistics
title The response of lead-tungstate scintillators (PWO) to photons with energies in the range 13 MeVa64 MeV
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